That is not a D500 truck, all the D500 truck with Bud type wheels had 5 lug studs on them, the D600 have 6 lugs and the D700 and bigger have ten lug hubs
I'm not sure if that is the original Rettig Bros truck or a tribute truck
Same thing on the car, I've race at the same races as a car that looks a lot like that more than once a long, long time ago. I'm going to say it looks like Don Wann 1963 Plymouth M.W. car but his may have been either a Savoy two door sedan or maybe a Belvedere two door sedan ,not a Hardtop Fury CRS